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Samurai range Screw Type Water Chillers Cooling Only & Heat Pump Versions

CHILLERS

Models Air cooled cooling only 40-400HP (112-1030kW) Air to Water heat pump 40-240HP (106-585kW) Water cooled cooling only 40-240HP (134-696kW) Water cooled cooling only 40-120HP (120-360kW)


Contents

Company profile

04

Product range overview

06

Features and benefits

08

Technical specification

12

Technical description

20

Options and accessories

22

Quality process and maintenance

25

3


Company profile Air Conditioning from HITACHI can justifiably be described as the art of exploiting the latest ideas and developments in technology to create a range of innovative products which provide more comfortable and more productive environments in which people can happily live and work. It is also an art executed with a responsible concern for protecting the environment. Ecological thinking begins at the very first stages of new product design and continues throughout production, installation procedures, equipment and operation.

Specifiers and users alike can always be assured that performance and costs are not the only parameters by which HITACHI products can be judged. To achieve success with such objectives on a global scale requires not only enormous resources but also a commitment to the future. As one of the largest companies in the world, with over 347,424 employees, HITACHI is well positioned to undertake this commitment with the confidence that comes from successfully responding to the changing needs of people for over 90 years. HITACHI - in Japanese the name means sunrise - is at the forefront of research and development turning new ideas and innovations into new products. Of its $80.9 billion sales worldwide, close to 4.3% was invested in research and development programs. This vast amount of money has given HITACHI the opportunity to conceive many “world firsts” - examples of which include the technologically advanced and acclaimed scroll and semi-hermetic Screw compressors. These have been incorporated in HITACHI’s air conditioning systems and water chillers which have revolutionised air conditioning worldwide.

Medium 3D instrument for the screw compressor rotors.

In 1992 HITACHI invested in a new purpose built, state of the art factory (HAPE) in Barcelona, Spain. The site of the factory was carefully chosen to accomodate further building on its 40,000 square metre site. The creation of a European manufacturing facility and customer training centre helps to reduce production costs, speed up delivery times and enables full support to be given to all customers. HITACHI’s advanced air conditioning products are specified all over the world, wherever there is a requirement for ultimate performance and cost effective, long term reliability.

A wide range of units coupled with a choice of advanced control systems mean HITACHI can provide solutions to meet every possible air conditioning application or specification. Authorised Distributors all over the world contribute their own specialised technical support and practical assistance to provide individual system designs, commissioning and after sales service. HITACHI Authorised Distributors are committed to providing unrivalled support from a combination of experienced engineers, local product and spare parts stock, supported in turn by on-going technical support from HITACHI. From the initial product concept at HITACHI’s research and development facility in Japan, product development is dedicated to providing the products the customer requires. Product design and development is continuous with priority being given to the use of new, ecologically friendly refrigerants. To satisfy your cooling and heating requirements and to ensure the optimum indoor environment, consider HITACHI the first and last word in air conditioning.

HITACHI Air Conditioning Products Europe HAPE Works, Spain.

Hitachi Appliances Inc., Shimizu Works, Japan.

4

5


RCUE Air Cooled Cooling Only

Model RCUE Air Cooled Cooling Only (AG2)* Capacity (kW)

40

50

60

70

80

100 120 140 160 180 210 240 280 320 350 400

112 130 156 178 206 260 312 356 412 468 534 618 712 824 890 1030

RHUE Air Cooled Heat Pump

Model RHUE Air Cooled Heat Pump (AG2)*

Product range overview

Capacity (kW) (with optional heating function)

A key factor enabling such a compact footprint is the use of plate heat exchangers for both the condenser and evaporator. Both air and water-cooled ranges utilise Hitachi’s own highly reliable and efficient twin screw compressor. When combined with Hitachi’s advanced electronic control system the Samurai chiller is able to provide full modulation capacity control, therefore allowing the chiller to accurately match the required cooling load whilst maintaining the outlet water temperature to within +/- 0.5 degrees.

50

60

70

80

100 120 140 160 180 210 240 270 300 330 400

106 123 148 169 195 246 296 338 390 444 507 585 110 127 152 185 185 254 305 371 371 457 556 556

RCUE Water Cooled Cooling Only

The Hitachi Samurai Range is available in a capacity range of 106kW to 1030kW and is manufactured and tested in our state of the art production facility: HAPE, located just outside Barcelona in Spain. The Samurai air-cooled chiller is available in both Cooling Only and Heat Pump versions, cooling only from 112kW to 1030kW and Heat Pump from 106kW to 585kW. The Samurai water-cooled chiller is available from 120kW to 696kW (optional heating mode from 161kW 824kW) and is one of the most efficient water-cooled chillers available today.

40

40

50

60

80

RCUE Water Cooled Cooling Only (WG2) ■

Model

Capacity (kW) (with optional heating function)

100 120 150 180 200 240 270 300 330 400

134 160 194 232 320 388 445 525 600 696 161 192 233 274 384 467 526 621 719 824

RCUE Water Cooled Cooling Only Condenserless

Model RCUE Water Cooled Cooling Only Condenser Less (CLG) Capacity (kW)

40

50

60

80

100 120 140 150 160 180 200 210 240 270 300 330 400

120 145 180 240 290 360 * Copper fin available on request, not standard

6

7


Features and benefits

1. A  sliding valve in the screw compressor to change the refrigerant circuit variables, adapting them to the requested load. 2. A  sophisticated electronic system based on control bands in which the aim is to maintain a constant outlet temperature. There are 4 bands which can be configured: • LOAD UP 1 BAND • LOAD UP 2 BAND • NEUTRAL BAND • LOAD DOWN BAND

Sound levels and vibration are key factors during the operation of a chiller. In many applications it may be necessary to limit the sound level to permitted values, depending on local regulations.

When a precise response is required (when the measured temperature is close to the desired temperature), it can be programmed to give a more precise response.

The control signal is sent to the solenoid valves located in the compressor and those valves command the sliding valve’s movements. The signal has a variable length therefore the slider repositioning will be variable according to the control band.

Also the system’s great flexibility permits the installer to adapt the response times or the system’s precision to that specific installation. This is done by means of a simple programming of the microswitches in the micro-processor (see the Technical Catalogue).

The great advantage of this system is that it has control bands with different behaviours so the unit is better able to adapt to load requirements. When a quick response is needed (when the

Hitachi uses high technology to achieve the lowest sound. The new two bladed propellers, rather than four bladed, achieves a reduction of noise level, increases air flow volume, and at the same time provides an important reduction of motor power input.

The SAMURAI chillers operate at low sound and vibration levels due to the technical development of the HITACHI semi-hermetic screw compressors, precise machining and meticulous assembly during the production process. The compressors are mounted on rubber pads that protect the structure of the chiller

Compared to PID control systems, the advantage is that a faster response time can be achieved. The response in LOAD UP 1 is significantly quicker than a PID system, hence so is achieving the desired results.

When the band LOAD UP 1 is selected, the signal will last for 12 seconds. When the band LOAD UP 2 or LOAD DOWN is selected, the signal will last 2 seconds. When the NEUTRAL BAND is selected, the slider will stay where it is, as will the capacity.

Low Sound

The compressors are installed in an enclosure and covered with acoustic insulating material to further reduce the sound level as far as possible. The fans are also specifically designed to reduce

noise while permitting sufficient circulation of air for the correct operation of the unit. The new AG2 unit is fitted with a DC Inverter Fan in order to adapt the air flow more efficiently and therefore control the discharge pressure and the acoustic impact. It is also possible to select the unit with the “Low Noise and Super Low Noise” options. In this case, the insulation of the compressor enclosure increases. Therefore it is possible to achieve a further reduction of 4 dBA. These features of the SAMURAI chiller can help to reduce the overall installation costs as it can eliminate the need for any acoustic screens or external sound attenuation packages.

Sound Power Values (dBA) Reciprocating

Samurai

dBA

20

110

10

105

0

COMPETITOR Y

100

40 µm

To control the water temperature the SAMURAI uses two essential components as follows:

from possible compressor vibrations, which is why the overall result is absolutely balanced.

10 µm

Continuous capacity control is based on precise control of the water outlet temperature, depending on the thermal requirements of the load. This is reflected in lower operation costs as the unit will only provide the energy needed for the load.

Low Noise and Super Low Noise

measured temperature is very different from the desired temperature), the system can be programmed to provide quick control.

Given a load and having selected a water outlet temperature, the electronic system compares the value measured by thermistors with the desired value. Depending on the measured value, and at one-minute intervals, a control signal is generated that varies the position of the sliding valve either to increase or to decrease the capacity as required.

Amplitude (µm)

Precise Control of Outlet Water Temperature

95

-10

SAMURAI

90

-20

SAMURAI (with Low Noise Level Option)

85

0

0.02

0.04

0.06

0.08

0.10

0.12

80

Time (seconds)

75

Vibration Amplitude for the HITACHI Screw Compressor.

0

200

400

600

800

1000

1200

kW

Thermal Load Profile

Step Control does not Adapt to Variations in Demand.

%

Excellent Partial Load Performance

Air Cooled Models Efficiency at Partial Load

100 90 80

6.0

Typical Thermal Load Profile.

70

5.5 5.0

60 50 40 30

(Ambient Temperature)

4.5

Samurai’s Continuous Capacity Control Adapts Itself to the Load.

45ºC

4.0

40ºC 35ºC

3.5

30ºC

3.0

20

25ºC

2.5

10 0

12

0

The combination for the two can be summarised in the diagram to the left.

Hour

24

20ºC

2.0 1.5 1.0

0

20

40

60

80

100

120

(%) Cooling Capacity

140

How does Continuous Capacity Control Work? ºC 19 Water Temperature

17

LOAD UP 1 12 sec. 60 sec.

Start Operation

15 13 11

Inlet Temp.

LOAD UP 2

Temp. Outlet

2 sec. 60 sec.

Annual Power Consumption (KW/h/year)

Reciprocating Type

t

Inlet Temperature

Step Capacity Control

100%

Continuous Capacity Control

87%

ESEER (In accordance with Eurovent)

SAMURAI 66%

9

Stop

5 Neutral Zone Load is Maintained

(*) Based on Typical thermal load for air conditioning. HITACHI’s comparison.

Outlet Temperature

7

8

OPERATIONAL COST SAVING (*)

t

LOAD DOWN 2 sec. 60 sec.

t

By Controlling the Inlet Temperature, the Compressors are Activated Again

As the Samurai utilizes continuous capacity control it is able to match the required cooling capacity accurately. This enables the Samurai to control on outlet water temperature rather than inlet. Additionally, thanks to the meticulous design of the control system, the performance of the unit at partial loads is excellent. As can be seen, the variations in the input capacity are smaller than the variation of the unit’s cooling capacity. This leads to an increased COP at partial loads and a significant advantage over competitor’s chillers.

Time Model

40AG2

50AG2

60AG2

70AG2

80AG2

100AG2

120AG2

140AG2

160AG2

180AG2

210AG2

240AG2

280AG2

320AG2

350AG2

400AG2

ESEER

3.21

3.58

3.51

3.5

3.48

3.58

3.49

3.49

3.48

3.5

3.51

3.48

3.5

3.48

3.5

3.48

The ESEER (European seasonal energy efficiency ratios) are published in the opposite table for the AG2 chiller. This indicates the average energy efficiency at part load based upon the four operating conditions defined by Eurovent. 9


Features and benefits The electrical starting system in the SAMURAI range prevents you from having to install oversized electrical wiring due to the peak currents that are usually caused by conventional chillers. This is due mainly to two reasons. Firstly, the compressor’s electrical motors have a STAR-DELTA starting system which is installed as standard equipment in each compressor and allows a significant reduction in the compressor’s starting power. Secondly, SAMURAI chillers employ a staged start-up process. If the system has more than one compressor, start-up

begins with the unit that has worked the least hours. This compressor is run at minimum load so as to minimize the power load on the installation. After a one-minute delay the second compressor is then started. Both compressors continue to run at minimum load as the next compressor begins to operate, and so on, until all the compressors are working at minimum load. After a thirty second safety delay the machine increases to normal (rated) power. Staged start-up in this way has two basic advantages. Firstly, the instantaneous power consumption by each compressor during start-up is lower than if all the compressors were started simultaneously.

Small Installation Space

Secondly, given that start-up power is minimized, cable dimensions are not affected and at no time is the system subjected to overloading.

High Power Factor

50 40

kW 800

30 25 20 15 10 5 0 Service space

300 600

700 600

250 500

500

200 400

SAMURAI

(c)

SAMURAI

(c)

(a) Direct starting of 3 compressors simultaneously. (b) Star-delta starting of 3 compressors simultaneously. (c) Combined star-delta + staged HITACHI starting.

(a) Direct starting of 3 compressors simultaneously. (b) Star-delta starting of 3 compressors simultaneously. (c) Combined star-delta + staged HITACHI starting.

10

(b)

0 0 Starting system Starting system

Starting system

contact can be installed in the Electrical Box in order to control the compressor/s of the unit.

Minimum amount of Refrigerant SAMURAI chillers use a stainless steel plate heat exchanger as the evaporator. This exchanger is far more compact than the traditional shell & tube type heat exchangers. It takes up far less space even though it exchanges the same capacity. Thanks to this technological development, SAMURAI requires the lowest charge of refrigerant on the market. This leads to lower operating costs once the system is in operation, as the amount of refrigerant that may need to be replaced during maintenance operations will be minimal.

Kg of Refrigerant 450 400 350

COMPETITOR Y SAMURAI

300 250 200 150 100 50 0

0

200

400

600

800

1000

1200

1400

kW

New Electronic Expansion Valve

This minimum possible capacity makes it possible to reduce the minimum installation volume when required, in accordance with the following figures:

These units are equipped with an electronic expansion valve to provide sophisticated control under any temperature conditions.

Minimum Amount of Water in the Installation

COMPETITOR Y

8 7 6 5 m3

SAMURAI chillers require a small installed volume since the capacity control range is very wide (15%-100%). Furthermore, by utilising the optional function (volt free contact) this external

(a)

50 100

0

To prevent an excessive number of compressor starts and stops, which results in reducing their useful life, the installation must have a minimum amount of water to provide the system with the required thermal inertia.This minimum required volume depends on how good the control system is and what is the minimum capacity of the unit.

SAMURAI

100 200

(b)

Minimum Amount of Water in the Installation

Star Delta Reduction is 66%

150 300

(a)

100

Figure shows cooling capacity values per square meter installed, using the model HITACHI RCUE 80 AG2 and similar models from competitors.

To another chiller: 2000 mm To an obstacle: 1200 mm

Staged + Star Delta DIRECT Reduction is 80%

350 700

Staged + Star Delta Reduction is 80%

200

COMPETITOR Y

35

kW

kW

300

COMPETITOR X

Reduction in Instantaneous Electrical Power Consumption

Reduction in Instantaneous Electrical Power Consumption

400

SAMURAI

45

Electricity companies usually charge extra for consuming the reactive energy used in electric motors to generate the magnetic field that is necessary for them to work. SAMURAI chillers operating in nominal conditions have a high power factor - normally exceeding a value of 0.9 at full load. It is therefore not necessary to install a series of capacitors to compensate for the reactive energy consumed, since this is minimal.

Reduction in Instantaneous Electrical Power Consumption

800

Often the space available for the installation of a chiller is a critical factor. Obstacles plus the lack of space are usually a decisive factor when selecting the equipment to be installed in HVAC facilities. Due to the meticulous design of each and every component, it is possible to achieve exceptionally high cooling capacity values per square meter installed with HITACHI Samurai chillers. Due to the design quality it is easy to access all of the major components and subsequently the service access required for the chiller can be reduced to a minimum.

Cooling Capacity per m2 Installed kW/m2

Ideal Starting System

SAMURAI

4

The electronic expansion valve provides reduced electrical power consumption compared to the classical system.

3 2 1 0 0

200

400

600

800

1000

1200

1400

kW

11


General Data Model

40 AG2

50 AG2

60 AG2

70 AG2

80 AG2

100 AG2

120 AG2

140 AG2

160 AG2

180 AG2

210 AG2

240 AG2

280 AG2

320 AG2

350 AG2

400 AG2

312

356

412

468

534

618

712

824

890

1030

299

347.8

3.0

3.0

Cooling Capacity

kW

112

130

156

178

206

260

Total Power Input

kW

36.4

42.7

52.3

59.8

69.6

85.4

3.1

3.0

3.0

3.0

3.0

3.0

COP Outer Dimension Height Width Depth

mm mm mm

3.0

3.0

3.0

3.0

3.0

3.0

Natural Grey

Shipping Weight

kg

Compressor Type

Models –

3.0

3.0

2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 2,430 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 1,900 2,150 2,150 2,150 2,750 2,750 4,050 4,050 5,250 5,250 5,950 7,750 7,750 10,250 10,250 12,750 12,750

Cabinet Colour

Natural Grey

1,430 1,470 1,560 1,760 1,820 2,830 3,000 3,420 3,550 4,450 5,070 5,250 6,750 7,000 8,450 8,750 Semi-Hermetic Screw Type

Semi-Hermetic Screw Type

40 40 50 60 60 40 50 60 60 50 60 60 60 60 60 60 ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z ASC-Z

Quantity

Oil Heater

W

1

1

1

1

1

2

150

Capacity Control

RCUE Air Cooled Cooling Only

104.5 119.6 139.1 156.8 179.4 208.7 239.2 278.2

2

2

150x2

2

3

150x2

3

3

4

150x3

4

150x4

Continuous Capacity Control

Continuous Capacity Control

%

15 ~100

15 ~100

Water Cooler Type

Brazing Plate Type

Brazing Plate Type

Condenser Type

Multi-Pass Cross Finned Tube

Multi-Pass Cross Finned Tube

Fan Motor (pole)

kW

0.38(8)

0.38(8)

Refrigerant Type

Charge

kg

4

4

4

Oil Type

6

8

8

12

12

12

18

18

R407C 39

46

49

Flow Control Number of Circuits

6

59

64

Evaporator Type

1

1

1

24

30

30

R407C 46 x 2 49 x 2 59 x 2 64 x 2 49 x 3 59 x 3 64 x 3 59 x4 64 x 4 59 x 5 64 x 5

Electrical Expansion Valve 1

24

5

150x5

Working Range

Quantity

5

1

2

Electrical Expansion Valve 2

2

2

3

3

3

4

4

5

Japan Energy Freol UX300 (Ester)

Japan Energy Freol UX300 (Ester)

Stainless steel plate heat exchanger brazed with copper

Stainless steel plate heat exchanger brazed with copper

5

Nominal Water Flow

m³/h

19.3

22.4

26.8

30.6

35.4

44.7

53.7

61.2

70.9

80.5

91.8

106.3 122.5 141.7 153.1 177.2

Pressure Drop

kPa

21.9

24.7

23.6

30.3

40.1

24.6

23.6

30.3

40.1

23.4

30.1

39.8

Max. Pressure

MPa

1.0

30.5

40.3

30.1

39.9

1.0

Connections inches 3” Victaulic 3” Victaulic (1xInlet / 1xOutlet) (2xInlet / 2xOutlet)

3” Victaulic 3” Victaulic (2xInlet / (3xInlet / 3xOutlet) 2xOutlet)

3” Victaulic (4xInlet / 4xOutlet)

3” Victaulic (5xInlet / 5xOutlet)

Control System

Micro-Processor Control

Micro-Processor Control

Chilled Water Outlet Temperature

˚C

5 ~ 15 (-10 ˚C Option)

5 ~ 15 (-10 ˚C Option)

Condenser Air Inlet Temperature

˚C

-15 ~ 46

-15 ~ 46

Sound Power Level

dB

82

83

84

85

85

86

87

88

88

89

91

91

92

92

94

94

dB (A)

64

65

66

67

67

67

68

69

69

69

70

70

71

71

72

72

Sound Pressure Level Power Supply

3~, N / 380V-415V / 50Hz

3~, N / 380V-415V / 50Hz

NOTES:

12

Cooling capacity, input power, flow rate and water pressure drop calculated according to EN12055 for standard conditions.

Heating capacity according to EN12055 for standard conditions (Ambient = 8°C DB, outlet water = 45°C, inlet water = 40°C

(Ambient = 35°C, chilled outlet water = 7°C and chilled inlet water = 12°C, Condenser water inlet 30°C and condenser water outlet 35°C, Refrigerant saturated vapour temperature = 45°C)

(1) L  ow temperature applications are as an option (see chapter for options) (2) High condensing temperature applications are available as an option (see chapter for options).

(3) S  ound power values according to EUROVENT test. Sound pressure measured to 1.5m height and 1m from control panel.

13


General Data Model

40AG2

50AG2

60AG2

70AG2

80AG2

100AG2

120AG2

140AG2

160AG2

180AG2

210AG2

240AG2

kW

106

123

148

169

195

246

296

338

390

444

507

585

Total Power Input in Cooling kW

36.4

42.7

52.3

59.8

69.6

85.4

104.5

119.6

139.1

156.8

179.4

208.7

COP (cooling)

2.9

2.9

2.8

2.8

2.8

2.9

2.8

2.8

2.8

2.8

2.8

2.8

Cooling Capacity

Heating Capacity

– kW

110

127

152

185

185

254

305

371

371

457

556

556

Total Power Input in Heating kW

40.7

44.5

54.3

67.7

67.7

89

108.6

135.5

135.5

162.9

203.2

203.2

COP (heating)

2.7

2.9

2.8

2.7

2.7

2.9

2.8

2.7

2.7

2.8

2.7

2.7

mm mm mm

2,430 1,900 1,900

2,430 1,900 1,900

2,430 1,900 1,900

2,430 1,900 2,500

2,430 1,900 2,500

2,430 1,900 3,800

2,430 1,900 3,800

2,430 1,900 5,000

2,430 1,900 5,000

2,430 1,900 5,700

2,430 1,900 7,500

2,430 1,900 7,500

5,440

5,650

Outer Dimension Height Width Depth Cabinet Colour

Natural Grey

Shipping Weight

kg

Compressor Type

Models –

1,550

1,600

40 ASC-Z

40 ASC-Z

50 ASC-Z

1

1

1

Oil Heater

W

RHUE Air to Water Heat Pump

Quantity

Refrigerant Type

Charge

kg

Number of Circuits

– –

60 ASC-Z

60 ASC-Z

40 ASC-Z

50 ASC-Z

60 ASC-Z

60 ASC-Z

50 ASC-Z

60 ASC-Z

60 ASC-Z

1

1

2

2

2

2

3

3

3

Semi-Hermetic Screw Type

150x2

150x2

Brazing Plate Type

Brazing Plate Type Multi-Pass Cross Finned Tube

0.38(8) 4

39

46

49

6

8

8

12

12

64

64

46 x 2

49 x 2

64 x 2

64 x 2

1

1

1

2

2

25.5

Pressure Drop

kPa

19.7

22.2

21.3

Max. Pressure

MPa

18

49 x 3

64 x 3

64 x 3

2

3

3

2

3

Japan Energy Freol UX300 (Ester)

Stainless steel plate heat exchanger brazed with copper 21.2

18

Electrical Expansion Valve

Japan Energy Freol UX300 (Ester)

18.2

12 R407C

Electrical Expansion Valve 1

150x3

0.38(8) 6

R407C

1

4,780

Multi-Pass Cross Finned Tube

m³/h

Stainless steel plate heat exchanger brazed with copper

29.1

33.5

42.3

50.9

58.1

67.1

23.5

30.9

22.2

21.3

23.4

30.8

1.0

76.4

87.2

100.6

21.1

23.6

31.1

1.0

Connections inches 3” Victaulic (1xInlet / 1xOutlet) Control System

3,780

15 ~100

4

Evaporator Type Nominal Water Flow

3,670

Continuous Capacity Control

4

Flow Control

Oil Type

3,250

15 ~100

kW –

3,050

Continuous Capacity Control

%

Water Side Heat Exchanger –

Fan Motor (pole)

1,950

150

Capacity Control

Air Side Heat Exchanger

1,880

Semi-Hermetic Screw Type

Quantity

Working Range

1,670

Natural Grey

3” Victaulic

(2xInlet / 2xOutlet)

3” Victaulic 3” Victaulic (2xInlet / 2xOutlet) (3xInlet / 3xOutlet)

Micro-Processor Control

Micro-Processor Control

Chilled Water Outlet Temp ˚C

5 ~ 15 (-10 ˚C Option)

5 ~ 15 (-10 ˚C Option)

Heated Water Outlet Temp ˚C

35 ~ 55

35 ~ 55

Condenser Air Inlet Temp ˚C

-15 ~ 46 for Cooling Operation

-15 ~ 46 for Cooling Operation

Evaporator Air Inlet Temp ˚C

DB: -9.5 ~ 21/WB: -10 ~ 15.5 for Heating Operation

DB: -9.5 ~ 21/WB: -10 ~ 15.5 for Heating Operation

Permissable Water Pressure Max.

MPa

Sound Power Level

dB

82

83

84

85

85

86

87

88

88

89

91

91

dB (A)

64

65

66

67

67

67

68

69

69

69

70

70

Sound Pressure Level Power Supply

1.0

1.0

3~, N / 380V-415V / 50Hz

3~, N / 380V-415V / 50Hz

NOTES: Cooling capacity, input power, flow rate and water pressure drop calculated according to EN12055 for standard conditions.

14

(Ambient = 35°C, chilled outlet water = 7°C and chilled inlet water = 12°C, Condenser water inlet 30°C and condenser water outlet 35°C, Refrigerant saturated vapour temperature =45°C).

Heating capacity according to EN12055 for standard conditions (Ambient = 8°C DB, outlet water = 45°C, inlet water = 40°C (1) L  ow temperature applications are as an option (see chapter for options) (2) High condensing temperature applications are available as an option (see chapter for options).

(3) S  ound power values according to EUROVENT test. Sound pressure measured to 1.5m height and 1m from control panel.

15


General Data Model

40WG2

50WG2

60WG2

80WG2

100WG2

120WG2

150WG2

180WG2

200WG2

240WG2

160

194

232

320

388

445

525

600

696

Cooling Capacity

kW

134

Total Power Input

kW

33.5

40

49.1

54.5

80

98.2

104.5

123.5

148.5

163.5

4.0

4.0

4.0

4.3

4.0

4.0

4.3

4.3

4.0

4.3

Outer Dimension Height Width Depth

mm mm mm

1,542 1,045 844

1,542 1,045 844

1,542 1,045 844

1,542 1,045 844

1,700 1,104 1,430

1,700 1,104 1,430

1,700 1,104 1,430

1,660 1,105 2,420

1,660 1,105 2,420

1,660 1,105 2,420

Cabinet Colour

Shipping Weight

kg

1770

2500

2580

2670

Compressor Type

Models

COP

Natural Grey 750

765

830

950

40ASC-Z

50ASC-Z

60ASC-Z

60ASC-Z

1670

50ASC-Z

60ASC-Z

60ASC-Z

50ASC-Z

60ASC-Z

60ASC-Z

Quantity

1

1

1

1

2

2

2

3

3

3

Oil Heater

W

Oil Type

Semi-Hermetic Screw Type

150

150 x 2

150 x 3

Japan Energy Freol UX300 (Ester)

Capacity Control

RCUE Water Cooled Cooling Only

1570

Continuous Capacity Control

Working Range

%

Refrigerant Type

R407C

Flow Control

Electrical Expansion Valve

For 1 compressor: 15~100

For 2 compressors: 15(7.5)~100

Number of Circuits

Control System

Micro-Processor

Condenser Type

Stainless steel plate heat exchanger brazed with copper

Nominal Flow

1

2

m³/h

28.8

34.4

41.8

49.3

68.8

Pressure Drop

kPa

37.1

37.3

39.1

61.8

67.8

Max. Pressure

MPa

Connections

inches

Evaporator Type

For 3 compressors: 15(5)~100

3

83.6

94.5

111.5

128.7

147.8

72.2

91.1

31.3

41

61.8

1.03 3” Victaulic (1xInlet / 1xOutlet)

3” Victaulic (1xInlet / 1xOutlet)

3” Victaulic (3xInlet / 3xOutlet)

Stainless steel plate heat exchanger brazed with copper

Nominal Water Flow

m³/h

23

27.5

33.4

39.9

55

66.7

76.5

90.3

103.2

119.7

Pressure Drop

kPa

30.8

36.7

35.8

43.1

37.7

54.3

70.5

29.4

37.9

43.1

Max. Pressure

MPa

Connections

1.03

inches

3” Victaulic (1xInlet / 1xOutlet)

3” Victaulic (1xInlet / 1xOutlet)

Chilled Water Outlet Temp ˚C

5 ~ 15

Cooling Water Outlet Temp ˚C Sound Power Level Sound Pressure Level Power Supply

3” Victaulic (3xInlet / 3xOutlet)

22 ~ 45

35 ~ 55

dB

83

84

86

86

88

90

90

91

92

93

dB (A)

68

69

71

71

72

74

74

75

76

77

Safety and Protection Devices

3~, N / 380-415V / 50Hz Reverse Phase Protection Device, Fuse and Thermal Relay for Compressor, Internal Thermostat for Compressor, Compressor Oil Heater, Control Circuit Fuse, High Pressure Switch, Low Pressure Control, Suction Gas Temperature Control, Freeze Protection Control and Compressor Operation Hour Meter

NOTES: Cooling capacity, input power, flow rate and water pressure drop calculated according to EN12055 for standard conditions.

16

(Ambient = 35°C, chilled outlet water = 7°C and chilled inlet water = 12°C, Condenser water inlet 30°C and condenser water outlet 35°C, Refrigerant saturated vapour temperature =45°C).

Heating capacity according to EN12055 for standard conditions (Ambient = 8°C DB, outlet water = 45°C, inlet water = 40°C (1) L  ow temperature applications are as an option (see chapter for options) (2) High condensing temperature applications are available as an option (see chapter for options).

(3) S  ound power values according to EUROVENT test. Sound pressure measured to 1.5m height and 1m from control panel.

17


General Data Model

50CLG

60CLG

80CLG

100CLG

120CLG

Cooling Capacity

kW

120

145

180

240

290

360

Total Power Input

kW

34.4

42.4

52.1

68.8

84.8

104.2

3.5

3.4

3.5

3.5

3.4

3.5

mm mm mm

1,343 1,064 935

1,343 1,088 935

1,343 1,152 935

1,531 1,184 1,432

1,531 1,184 1,432

1,531 1,184 1,432

COP Outer Dimension Height Width Depth

RCUE Water Cooled Cooling Only Condenserless

40CLG

Cabinet Colour

Shipping Weight

kg

Compressor Type

Models

40ASC-Z

50ASC-Z

60ASC-Z

40ASC-Z

50ASC-Z

60ASC-Z

Quantity

1

1

1

2

2

2

Oil Heater

W

150

Oil Type

Japan Energy Freol UX300 (Ester)

Capacity Control

Continuous Capacity Control

Natural Grey

630

680

730

Natural Grey

1200

Semi-Hermetic Screw Type

1310 Semi-Hermetic Screw Type

150 x 2 Japan Energy Freol UX300 (Ester) Continuous Capacity Control

Working Range

%

15 ~ 100

15 ~ 100

Refrigerant Type

R407C

R407C

Flow Control

Thermal Expansion Valve

Number of Circuits

1

Evaporator

Brazing Plate Type

Brazing Plate Type

Control System

Micro-Processor

Micro-Processor

Evaporator Type

Stainless steel plate heat exchanger brazed with copper

1380

Thermal Expansion Valve 2

Stainless steel plate heat exchanger brazed with copper

Nominal Flow

m³/h

20.6

24.9

31

41.3

49.9

61.9

Pressure Drop

kPa

26.5

24.5

24.4

43.9

50.6

64.7

Max. Pressure

MPa

1.03

inches

3” Victaulic (1xInlet / 1xOutlet)

mm

Ø41.3 (Outer Diameter)

Ø41.3 (Outer Diameter) x 2

Refrigerant Liquid Piping mm

Ø28.6 (Outer Diameter)

Ø28.6 (Outer Diameter) x 2

Chilled Water Outlet Temp ˚

C5 ~ 15

5 ~ 15

Condensing Temp

30 ~ 55

30 ~ 55

Connections Refrigerant Gas Piping

˚C

1.03 4” Victaulic (1xInlet / 1xOutlet)

Sound Power Level

dB (A)

82

84

86

86

87

89

Sound Pressure Level

dB (A)

68

69

71

71

72

74

Power Supply

Safety and Protection Devices

3 ~ ,N / 380-415V / 50Hz Reverse Phase Protection Device, Fuse and Thermal Relay for Compressor, Internal Thermostat for Compressor, Compressor Oil Heater, Control Circuit Fuse, High Pressure Switch, Low Pressure Control, Suction Gas Temperature Control, Freeze Protection Control and Compressor Operation Hour Meter

3 ~ ,N / 380-415V / 50Hz Reverse Phase Protection Device, Fuse and Thermal Relay for Compressor, Internal Thermostat for Compressor, Compressor Oil Heater, Control Circuit Fuse, High Pressure Switch, Low Pressure Control, Suction Gas Temperature Control, Freeze Protection Control and Compressor Operation Hour Meter

NOTES: Cooling capacity, input power, flow rate and water pressure drop calculated according to EN12055 for standard conditions.

18

(Ambient = 35°C, chilled outlet water = 7°C and chilled inlet water = 12°C, Condenser water inlet 30°C and condenser water outlet 35°C, Refrigerant saturated vapour temperature =45°C).

Heating capacity according to EN12055 for standard conditions (Ambient = 8°C DB, outlet water = 45°C, inlet water = 40°C (1) L  ow temperature applications are as an option (see chapter for options) (2) High condensing temperature applications are available as an option (see chapter for options).

(3) S  ound power values according to EUROVENT test. Sound pressure measured to 1.5m height and 1m from control panel.

19


Technical Description The SAMURAI water chillers are compact, air-cooled and equipped with continuous capacity microprocessor controlled screw compressors. They are delivered pre-charged with HFC R-407C (chlorine-free) refrigerant. Cooling only and Heat Pump versions are available. All units undergo a complete commercial test, checking that all the components are operating correctly. It is therefore only necessary to make the electric and hydraulic connections at the installation site.

The new ichi-ban semi hermetic screw compressor The Semi-hermetic screw compressor has been designed to work with the refrigerants R22 and R407C. As it is directly connected to the electric motor

it is not necessary to provide external electric motor connections which reduces the number of internal components.

there is no need for any external oil pipes which results in a compact design and high compressor reliability.

The compressors are mounted on antivibration rubber pads and are situated inside a sealed enclosure. This enclosure is patented by HITACHI, and reduces noise because it has a double coating.

Each compressor includes:

Due to the pressure difference between the high-pressure chamber and the lowpressure enclosure, lubricating oil is continuously supplied to the mechanical parts and to the moving piston that provides continuous capacity control. This system removes the need for an oil pump, adjustment valves, and associated mechanisms.

Water Side Heat Exchanger The SAMURAI chiller range uses an innovative plate heat exchanger. This exchanger allows the inner volume in the refrigerant cycle to be reduced, thus obtaining the maximum efficiency with the least possible amount of refrigerant. It is fabricated from AISI-316 stainless steel plate to prevent any corrosion.

•B  ipolar electric motor with stardelta starting circuit (standard) •S  olenoid valves for continuous capacity control •E  lectronic protection against high temperature, with centralized manual reset

Both refrigerant and water pass either side of profiled plates in contra-flow, across which the heat exchange occurs. These plates are profiled to induce turbulence in both the water and refrigerant flow in order to increase the efficiency and optimize the heat exchange process both in time and in space.

•N  ew cyclonic oil separator, oil level and sight glass • Mechanical operating time counter.

The new cyclonic oil separator is located inside the casing of the compressor so

With R407C, the cooling capacity of this type of exchanger is greater than traditional shell and tube type evaporators.

BMS Interface (HARC70-CE1) In case of connection to a Building Management System (available as an option), it is possible to manage:

Air Side Heat Exchanger The air side heat exchangers are constructed from copper tubes and aluminium fins (copper fins are an option), to the HITACHI patented “Slit Fin” design. The high efficiency of the aluminum fins combined with the internally grooved copper tubing make it possible to achieve a high heat transfer rate and a very compact size. The fins are covered with a protective layer of anticorrosion as standard.

Electrical Power and Control Panel ON/OFF switch, power supply, operation and alarm LED’s. Electrical power and control panel complete with contactors and circuit protectors for the compressors and fans. The power section conforms CEN-60204 standard. The electrical panel, inside the supporting structure, is fitted with a sealed door and is suitable for outside installation (Air cooled models). The setting functions are located on the rear side of the panel and are accessible by opening the control panel doors.

Microprocessor Control System HITACHI has designed a control system based on HITACHI technology. A sliding valve (which adjusts the point of compression) located in the compressor, controls the compressor’s capacity to adapt to the required load. This controls the leaving water temperature within a range of +/- 0.5 ºC. The microprocessor monitors various points in the chiller, controlling each refrigeration circuit through its characteristic variables. The microprocessor has up to 24 protection codes, 15 of which are different for each cycle. This guarantees safety during unit operation. The alarms are monitored through an interface and can be read in four 7-segment displays. The control system includes all the operating times required to protect the screw compressors and the electrical system.

• Unit On/Off

• Adjust cooling/heating mode You can monitor: • ON/OFF • Selected cold water temperature •A  ctual cold/heat water temperature • Alarm codes • Operation status For this function it is necessary to select the HARC70-CE1 interface from the options list. This interface permits the connection of up to 4 chillers using HLINK connection (HITACHI communications protocol). The communications protocol is LONWORKS.

Refrigerant Circuit Units are equipped with independent refrigerant circuits. Each circuit is equipped in the liquid line with: • • • • •

Strainer Drier Electronic expansion valve Stop valve Sight glass

Gas line: • Check valve • Stop valve (option) • Safety valve • 4 way valve (Heat Pump versions) Compressor protection: • High pressure switch • Low pressure control • Safety valve (option) • Protection control Others: • Accumulator (Heat Pump versions) • Receiver (Heat Pump versions)

DC Fan Motor with Outstanding Efficiency

Chillers Central Station (CSC-5S)

The DC fan motor greatly improves efficiency compared to conventional products using an AC motor. Also, air blasts are reduced by controlling the rotation speed of the fan.

CSC-5S newly developed for Hitachi screw chillers, provides individual control, quantity control and monitoring. It can be used for up to 8 chillers and installed according to the customer’s airconditioning environment. By remote control, the functions can be checked from the control room, so there’s no need to go out to the machine room for checking, unlike conventional machines.

PWM (pulse width modulation) concept of speed control The switching element (a power MOSFET) switches back and forth at a frequency of several tens of kHZ. This controls the ON/OFF duty rate per cycle and thus changes the voltage applied to the fan motor to control the rotation speed.

DC Fan Motor with Outstanding Efficiency

Motor Efficiency (%)

•A  djust the cold/heat water set point (outlet temperature)

Efficiency increased by 40% (motor input halved)

DC Motor

AC Motor Revolutions per Min (rpm)

20

21


Options and accessories

Specifications

A/C C/O A/C H/P

W/C

C/L

General

Low Noise Option / Super Low Noise All Painted Chiller Lower Guardnet Rear Cover Wooden Crate

■ ■ ■ ■ ■

Low Water Temperature

Outlet Temperature: 4~0˚C (Low 1) Outlet Temperature: -1~-5˚C (Low 2) Outlet Temperature: -6~-10˚C (Low 3)

■ ■ ■

Extended Minimum Capacity Control

Remarks

■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■

■ ■ ■

Compressor

Compressor Safety Valve Discharge Valve Suction Valve Twin Compressor Safety Valve

Control System

Compressor Circuit Breaker Protector ■ ■ ■ ■ Fan Motor Circuit Breaker Protector ■ ■ Change Over Local/Remote Control ■ Individual Alarms ■ Compressor Operation Hour Meter ■ Pump Freeze Protection Operation ■ Pump Operation Circuit ■ Non- Voltage Contact for Remote Indicators ■ DC24V Remote Control ■ Short Period Power off Protection ■ Heating Operation In High Ambient ■ ■ Magnetic Circuit Breaker ■ ■ ■

Condenser

Coated Fin ■ Copper Fin ■ Corrosion ■ High Condensing Water ■ ■ Heat Recovery (A/C) ■

Refrigerant Cycle

Independent Circuit ■ Suction Valve ■ ■ ■ ■ Dual Safety Valve ■ ■ ■ ■ Pressure Display (High and Low) ■ Suction Pressure Relief Valve ■ ■ STEK Coupling ■ ■ ■ ■ Pressure Port ■ ■ ■ ■

Evaporator

PED Certificate (97/23/EC) ■ PN16 Flanges ■ ■ ■ ■ Water Differential Pressure Switch ■ ■ ■ ■ Water Flow Switch ■ ■ ■ ■ Water Cooler Trace Heater ■ ■ ■ ■ Common Water Pipe ■ ■ ■ ■

Brine Applications: ■ ■ ■ ■ – Category 1 (0˚C 4˚C) – Category 2 (-1˚C -5˚C) – Category 3 (-6˚C -10˚C) Drain water valve Water Strainer

■ ■

■ ■

■ ■

■ ■

Others

Witness Test Anti-vibration Rubber Mats Double Packing

■ ■ ■

■ ■ ■

■ ■ ■

■ ■ ■

NA: Not Available

22

St.

DSW7-3 ON

(only standard for WG2, not available for AG2)

A/C: Air Cooled

W/C: Water Cooled

C/O: Cooling Only

H/P: Heat Pump

■ ■ ■ ■

ST: Standard

■ ■ ■ ■

■ ■ ■ ■ For Each Compressor For Each Fan Motor by Alarm Code Pump ON/OFF Operation Pump Operation Contact Pump, Chiller, Alarm Level or Pulse

Standard: Press display on Panel

C/L: Condenserless

23


Low Noise Option

• Water inlet/outlet temperature

Insulation Suction Pipe

Available for all models in the SAMURAI range. Reduces sound level by 4 dBA. When this option is requested, 8-pole fans specially designed for maximum noise reduction replace the standard 6-pole fans. The area that houses the compressor is also covered with acoustic insulating material and in addition, a lead-based sandwich-type coating is directly applied to the compressor housing.

• Protection codes

It is possible to add insulations in the suction side upon request.

Low Water Temperature Some applications require water outlet temperatures below 5 ºC (minimum cold water outlet temperature reachable with standard models). In this case it will be necessary to request that option. Depending on the required outlet temperature there are 3 categories: •C  ategory 1: Outlet temperature 0 to 4 ºC •C  ategory 2: Outlet temperature -1 to -5 ºC •C  ategory 3: Outlet temperature -6 to -10 ºC

Compressor & Fan Circuit Breaker When requesting that option, the overintensity fuses are replaced with magnetic switches (circuit breakers) in the compressor’s power circuit. The magnetic switches permit the power circuit to be reset immediately. Thus there is no need to replace any components as you would if the system were protected with fuses. The automatic switches have a trip current that is more precise than fuses, as the automatic switches are adjusted directly by HITACHI.

Central Station (CSC-5S) CSC-5S newly developed for the HITACHI screw chillers, provides individual control, quantity control and monitoring. It can be used for up to 8 chillers and installed according to the customer’s air-conditioning environment. By remote control, the functions can be checked from the control room, so there’s no need to go out to the machine room for checking, unlike conventional machines.

BMS control (HARC-70 CE1) To integrate the chiller in the global building system, you must request this interface. This interface allows the connection of up to 4 chillers to a global management system using the LONWORKS communications protocol. The system is easy to install, since with two wires it is possible to achieve communication between the chillers and the systems control unit through the HARC-70CE1. From there it will be possible to manage the unit’s ON/OFF and select the desired value of the cold water outlet temperature. It is also possible to obtain information about:

24

• Unit status (ON/OFF/Operation status) • Setting outlet water temperature

Numbered Cables The unit is delivered with documentation that details the electrical diagrams with the location and numbering of each wire.

Rear Guard Net It is possible, if necessary, to request a protective net for the rear of the chiller, similar to the side protection net.

Copper Fin For some special applications, i.e. saline environments, it might be necessary to replace the Aluminum in the condensers with Copper to protect against the corrosive environment. In addition, the main parts of the condenser are coated with anticorrosion paint.

All Painted Chiller It is possible to order a chiller that is specially protected against corrosion. In this case, the unit’s components have a special anticorrosion treatment. The main parts are painted with anti-corrosion paint. In case of salty or highly corrosive environments, request this option together with the Cu/Cu condensers.

High Condensing Water When it is needed, one application with, for instance, Dry coolers, High Condensing Temperature is needed to reduce as much as possible the size of the condensing unit. In this case it is possible to order this option and to reach 55˚C as Water condenser outlet temperature.

Suction and Discharge Valves for Compressor To be able to close the refrigerant circuit and thus make it easier to maintain the compressor, ball valves can be installed in the compressor suction and/or discharge lines. Whenever a ball valve is placed at the discharge, a safety valve will automatically be installed in the compressor.

Dual Safety Valve Consists of installing two safety valves in parallel, of which only one is operational. This way it is possible to prevent having to reload the refrigerant cycle each time you must change the valve, be it for maintenance or operating reasons.

Compressor Safety Valve (Dual safety Valve) It is also possible to install the safety valves at the compressor outlet if the customer considers this appropriate. The double valve serves the same purpose as in the previous option.

Suction Pressure Relief Valve An additional pressure relief in the suction side of the compressor could be installed if required by the customer.

STEK Coupling These can be installed in place of flare connections and consist of an adapter that has a welded copper tube, a nut, and a copper joint to guarantee at all times a copper-copper contact in the joint.

PN 16 Flanges To connect the unit to the cold water line, PN 16 flanges can be welded to the unit, plus the corresponding watertight seals that enable and ensure a perfect installation and absolute water tightness.

Water Differential Pressure Switch The standard units have a protection system to prevent them from being connected when the water pump is stopped. It is also possible to detect any obstructions that may exist in the water pipes by installing a switch that evaluates the pressure difference between the water inlet and outlet pipes.

Water Flow Switch (installed on site) This option achieves the same effect as the differential pressure switch, but uses another kind of mechanism. In this case a switch is installed that evaluates the flow circulating through the installation. This switch is provided separately, and must be installed on site.

Water Cooler Trace Heater In cold climates, it may be necessary to install this accessory to protect the evaporator from freezing. It is an electric heater that is activated when the ambient temperature falls below 2ºC, and protects the evaporator (Joule effect) from internal frost.

Quality process and maintenance

Common Water Pipe Using this option it is possible to have only one inlet and one outlet connection for the multiple plate heat exchanger units.

Witness Test If the customer so requires, it is possible to witness the test of their unit at the factory. During this inspection, the customer can verify the appearance, the dimensions, the cooling capacity, the activation of the various safety devices, temperature control, the possible existence of refrigerant leaks, etc.

Foundation Rubber Anti-Vibration Mounts This option is available to reduce, to the maximum extent possible, the transmission of vibrations to the structure on which the unit is placed. It consists of placing a series of rubber anti-vibration pads underneath the unit at the time of installation. For additional details on how to do this, see the Technical Catalogue.

25


last 10 fault codes, the indication of the capacity control value, and the indication of the various different variables of the refrigerant circuit. These variables are, for example, for each cycle: discharge and suction pressures, discharge and suction temperatures, temperatures of the condenser liquid, cold water inlet and outlet temperature, etc.

Hitachi Air Conditionings Products Europe SA (HAPE), the industrial division for air conditioning products in Europe is committed to manufacture products of the highest quality with full respect for the environment. Proof of this are the company’s ISO 9002 and ISO 14001 certifications.

Up to 24 different alarms may show up as error codes, each of which indicates a different fault in the unit’s operation. Furthermore, if the fault occurs in a single refrigerant circuit, the display will show in which one, in order to make maintenance work easier.

During the manufacturing process of the Samurai chillers both work in progress and finished products are submitted to various controls that ensure compliance with the established specifications.

The different checks that are made can be divided into two categories: • Electrical or operating tests • Pressure and leakage tests These tests are made both on the assembled components at different stages during the production process and on the finished product. For the electrical and operating tests, once the electronic panel is assembled and all the pertinent connections have been

made, an exhaustive test is performed of all the electric/electronic components, by using a simulator. Mechanical tests are performed at various stages, checking especially the status of the many welds that are made. Thus, every time a set of copper pipes is made or condensers are assembled, and before they are mounted in the unit, they are filled with refrigerant at maximum design pressure to check that there are no leaks. To do this, special equipment

is used that detects concentrations of refrigerant of as little as 0.8gr/year. Once these components are 100% inspected, they are assembled. After the assembly of the entire unit has been completed, a new leak test is performed, especially inspecting all the mechanical joints. As many as 16 critical points in the refrigerant cycle are exhaustively controlled, in addition to checking each and every single weld in the system.

Easy to Program HITACHI has searched for the maximum flexibility when configuring SAMURAI chillers. This makes it easy to adapt them to any kind of installation, either for Air Conditioning applications or for industrial cold water supply applications. All the unit’s operating variables are totally configurable. All you need to do is to manipulate some micro-switches located in the general electronic section, behind the control panel. By simply selecting the status of these micro-switches (ON/OFF), you can select the desired temperature, control band, cooling speed, etc. This simple programming method provides a reliability that is unique in the market, since it avoids complicated programming routines that

if not correctly performed, can cause serious operating problems. HITACHI has managed to develop a very simple programming system that is very precise and extremely reliable. It is therefore ideal both for Air Conditioning systems and for demanding industrial processes.

Services HITACHI has a large network of distributors throughout Europe, who are always available to provide any required technical information about their products. By providing training courses and technical documentation. HITACHI wishes to provide its customers with the maximum possible amount of knowledge regarding its SAMURAI chillers.

During this test, the chiller is placed in operation at standard power. Meanwhile, various operating tests are made, checking: • the correct operation of the fans: how many are working and the correct rotation direction • the unit’s control capacity depending on the cold water outlet temperature

Operating Space

Easy Handling

Thanks to the location and choice of components, especially the plate heat exchanger, the SAMURAI chiller has lots of space inside, and permits problem-free access to all components to perform all necessary checks.

When the time comes to turn on the unit, you will see how simple HITACHI’s electronic control system really is. Starting with the control panel, which has been fully simplified so that it is totally comprehensible. The control panel consists of:

Compressor It is possible to specify optional extras to facilitate ease of servicing, for example, the suction and discharge valves (that block off the compressor), double circuit and compressor safety valves, that permit replacing one of them without having to empty the refrigeration circuit, etc.

26

• 2 double 7-segment LED’s • 4 selection buttons. From this simple control panel you have access to all the unit’s variables. With the ON and OFF buttons you can turn the unit on and off. With the “CHECK” buttons, you can access the log of the

SAMURAI electronic control system simulator used in training courses.

• ON/OFF by remote control •a  ctivation of the various safety devices that control the correct operation of the refrigerant cycle, simulating extreme operating conditions • the operation of the chiller’s ON/OFF control by the circuit pump.

All the chillers are submitted to a Commercial Test, during which the unit is tested by simulating actual operating conditions.

During the COMMERCIAL TEST, all the critical points and welds in the chiller are checked again to detect any possible refrigerant leaks. As a result of the COMMERCIAL TEST, real time data for all the refrigerant cycles, load water status and ambient temperature variables are obtained by means of a series of strategically placed probes (temperature, pressure, flow, intensity and current).

All this data is processed by a control computer that continuously reports on the unit’s performance. Once all the nominal values are reached, a check is made to ensure that all the measured parameters meet the declared levels (cooling capacity, power input, etc). The unit is then declared ready for delivery to the customer.

27


Specifications in this catalogue are subject to change without notice in order that HITACHI may bring the latest innovations to their customers, omitting typing errors. Hitachi Europe Ltd. Whitebrook Park, Lower Cookham Road, Maidenhead, Berkshire SL6 8YA United Kingdom tel: 01628 585394 email: aircon.enquiries@hitachi-eu.com www.hitachiaircon.com HELGB CHL 002

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